In a "call to arms" for conservation biologists, NGOs, and governments to guide this investment to both encourage economic development and safeguard natural habitat, author Bill Laurance and his colleagues catalogue known mineral deposits and examine where they converge with biodiverse areas. As much as a quarter of the continent's mineral wealth is concentrated in three areas in Cameroon, Gabon and the Democratic Republic of Congo. The map below shows one of these mineral hotspots along the Rift Mountains in eastern Congo, where they overlap with areas of forest loss between 2001 and 2013.